This document provides a lesson on prepositions. It defines prepositions as words that show the relationship between two things by answering questions like where, when, or how. Examples of common prepositions are given like on, at, by, from. The lesson explains that prepositions are part of prepositional phrases which consist of a preposition followed by a noun or pronoun. Students are then tested on identifying prepositions, prepositional phrases, and the object of a preposition in sample sentences.